Physics of the Solid State最新文献

{"title":"Study of the Formation of Cu(II) Coordination Compounds with 2-Formylpyridine 4-Phenylthiosemicarbazone in Solutions","authors":"E. Tutovan,&nbsp;T. Isac-Gutul,&nbsp;E. Donev,&nbsp;E. Neguta,&nbsp;Ion Bulimestru","doi":"10.1134/S1063783426603541","DOIUrl":"10.1134/S1063783426603541","url":null,"abstract":"<p>The complex formation of Cu(II) with 2-formylpyridine 4-phenylthiosemicarbazone (HL) in solutions containing Cu(NO₃)₂ or Cu₂(edta) has been studied (edta^4– = ethylenediaminetetraacetate). The UV-Vis spectra of HL show that, in the pH range 5.29–11.00, the maxima are located at 318 nm, whilst the absorption intensity varies slightly. At pH values of 2.00 and 12.00, a bathochromic shift of the maximum is observed. The spectra of the complexes formed in the Cu(NO₃)₂/HL and Cu₂(edta)/HL systems are visually identical and each displays two maxima at 342 and 393 nm which positions remain unaltered with changes in pH. The absorption intensity of the complexes varies only slightly over a rather wide pH range. It has been established that, within the temperature range 10–80°C, the positions of the maxima remain unchanged for the ligand and the complexes, while the absorption intensity decreases only slightly with increasing temperature. Using continuous variations and molar ratio methods it has been established that the complex formed in the Cu(NO₃)₂/HL system has a Cu(II)-to-ligand stoichiometric ratio of 1 : 1. The conditional stability constant of the complex for this system was determined using Komar’s method and was found to be β = 1.23 × 10⁵ L mol^–1 (<span>(log beta )</span> = 5.09). Application of the continuous variations and molar ratio methods to the Cu₂(edta)/HL system does not provide an unambiguous result, while Komar’s method proved to be inapplicable.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 11","pages":"946 - 958"},"PeriodicalIF":2.4,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Alloying Element M (M = Fe, Nb, Mo, Hf, and Ta) on the Stability and Elastic Properties of Ni2(Cr,W) Superlattice: A First Principles Investigation","authors":"Fuyun Wang,&nbsp;Jiwang Zhang,&nbsp;Xiaobing Zhang,&nbsp;Guangming Cheng,&nbsp;Guiyuan Zhang","doi":"10.1134/S1063783426601736","DOIUrl":"10.1134/S1063783426601736","url":null,"abstract":"<p>Ni₂(Cr,W) superlattice is a newly found age-hardened phase in Haynes 230 alloy, which has great influence on the creep performance of the alloy. We have employed first-principals method based on density functional theory to elucidate the effect of multi-alloying on the stability and elastic properties of Ni₂(Cr,W) superlattice. We find that Ni₂Cr<span>(_{{1--2x}})</span>W_<i>x</i>M_<i>x</i> (M = Fe, Nb, Mo, Hf, and Ta) superlattices are more energetically stable relative to Ni₂(Cr,W) superlattice, indicating that the studied alloying elements may improve the stability of Ni₂(Cr,W) superlattice to different extent, except for Fe based on DOS analysis. According to the elastic properties investigation, it is revealed that W + M (M = Nb, Mo, and Ta) co-alloying could improve the ductility tendency of Ni₂(Cr,W) superlattice. Mo and Nb are relatively effective alloying elements for the Ni₂(Cr,W) superlattice in terms of formation enthalpy and ductility in the studied elements.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 11","pages":"927 - 934"},"PeriodicalIF":2.4,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decomposition Kinetics and Thermal Stabilization via Interfacial Restrictions in PS/TiO2 Nanocomposites","authors":"A. M. Rahimli,&nbsp;M. A. Jafarov,&nbsp;B. G. Pashayev,&nbsp;K. I. Ahmadov","doi":"10.1134/S1063783426603188","DOIUrl":"10.1134/S1063783426603188","url":null,"abstract":"<p>This study investigates the structural morphology, chemical integrity, and non-isothermal decomposition kinetics of polystyrene (PS) nanocomposites incorporated with titanium dioxide (TiO₂) nanoparticles (3, 5, and 10 wt %). Scanning electron microscopy (SEM) confirmed high nanoscale dispersion of quasi‑spherical clusters ranging between 32 and 69 nm within the polymer domain. Fourier transform infrared (FTIR) spectroscopy verified the structural integrity of the PS backbone alongside a progressive development of the characteristic Ti–O–Ti bridging framework below 800 cm^–1. Solid-state kinetic analysis via a modified Coats–Redfern method revealed a non-linear dependency of the effective activation energy (<i>E</i>_a) on the conversion degree (α). Thermodynamic state functions (Δ<i>G</i>, Δ<i>H</i>, Δ<i>S</i>) demonstrate that the rigid TiO₂ surfaces impose severe local spatial and entropic restrictions on the decomposing macromolecular radicals. This tortuous network successfully regulates the energetic landscape, offering a highly efficient mechanism for physical thermal stabilization.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 11","pages":"899 - 905"},"PeriodicalIF":2.4,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Regulatory Effect of CsCl Addition on the Morphology of Carbon Nanomaterials: From Nanospheres to Nanoneedles","authors":"Lazang Gengga,&nbsp;Bo Meng,&nbsp;Haichao Li","doi":"10.1134/S1063783426603097","DOIUrl":"10.1134/S1063783426603097","url":null,"abstract":"<p>The morphology of nanomaterials significantly affects their physical and chemical properties. In this study, Tetradecyltrimethylammonium bromide was used as the carbon source, and sodium bromide (NaBr) and a mixture of CsCl with NaBr were used as spacers to prepare carbon nanospheres and carbon nanoneedles, respectively. Characterization techniques included SEM, XPS, XRD, Raman spectroscopy, and FT-IR spectroscopy, the results demonstrate that carbon nanoneedles have a higher degree of graphitization and lower surface oxidation. The introduction of CsCl significantly changed the morphology of the carbon nanomaterials, transforming them from spherical to needle-like structures.providing a new strategy for the design and control of nanomaterial morphology.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 11","pages":"959 - 965"},"PeriodicalIF":2.4,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermally Stable Perpendicular Magnetic Anisotropy in MgO-Free CoFeB/Heavy Metal Bilayers Grown by Pulsed Laser Deposition","authors":"G. Kirichuk,&nbsp;A. Grunin,&nbsp;A. Goikhman,&nbsp;K. Maksimova","doi":"10.1134/S1063783426601207","DOIUrl":"10.1134/S1063783426601207","url":null,"abstract":"<p>Perpendicular magnetic anisotropy (PMA) in CoFeB-based thin films is a key phenomenon for the development of next-generation spintronic devices. The most common realizations of perpendicular magnetization are based on ferromagnet/oxide (FM/Ox) and ferromagnet/heavy metal (FM/HM) interfaces in canonical MgO/CoFeB/HM structures. In this work, we investigate the nature of PMA in purely metallic CoFeB/Mo and CoFeB/W bilayer structures grown by pulsed laser deposition (PLD) without an MgO underlayer. The optimal thickness ranges of the CoFeB and heavy-metal layers required for PMA formation were determined. A systematic investigation of the effect of vacuum post-annealing in the temperature range of 300–500°C on the magnetic properties revealed that increasing the annealing temperature enhances the effective perpendicular magnetic anisotropy energy (<i>K</i>_eff). CoFeB/Mo and CoFeB/W structures exhibited <i>K</i>_eff values of 1.1 × 10⁴ and 2.3 × 10⁴ J/m³ after annealing at 500°C, respectively. The results also showed that tungsten-capped structures exhibit higher saturation magnetization and thermal stability than molybdenum-capped CoFeB films. A comparative investigation of CoFeB/Mo structures grown on Si/SiO₂ and MgO substrates further revealed improved PMA properties at intermediate annealing temperatures. However, at 500°C, the thermal stability deteriorated completely. These results demonstrate that PLD-grown metallic thin-film structures are capable of developing PMA at the FM/HM interface with high thermal stability, expanding the prospects for designing spintronic devices without oxide layers.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"860 - 867"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cobalt Ferrite Nanoparticles Conjugated with Methylene Blue: A Promising Approach for Photodynamic Therapy in Breast Cancer","authors":"Hilal Çalık,&nbsp;Banu Süngü Mısırlıoğlu,&nbsp;N. Didem Kahya,&nbsp;Rabia Cakir","doi":"10.1134/S1063783425603455","DOIUrl":"10.1134/S1063783425603455","url":null,"abstract":"<p>Breast cancer, as the most frequently diagnosed malignancy, is the main cause of cancer mortality due to cancer all around the world among women. Therefore, developing effective breast cancer treatment approaches is crucial. Photodynamic therapy (PDT) is a novel and rapidly developing therapeutic approach that has been studied extensively in treating various cancer types. PDT depending on light-activated photosensitizers eliminate cancer cells selectively. Moreover, its effectiveness is highly improved by nanoparticle incorporation. In this study, cobalt ferrite nanoparticles (CFNPs) were prepared by the co-precipitation method, coated with mesoporous silica, and loaded with methylene blue (MB) as a photosensitizer. XRD, SEM, and FT-IR were used in carrying out structural analysis of the synthesized nanoparticles. First of all, XRD patterns demonstrated the spinel phase crystalline structure of the nanoparticles. The average size of crystallite was calculated 38 nm for Fe₃O₄ nanoparticles. This size decreased up to 15.8 nm for Co_1.5Fe_1.5O₄ nanoparticles together with depending on Co ratio. Afterwards, it increased, and it was calculated 37.8 nm for Co₃O₄ nanoparticles. Secondly, SEM analysis also showed that increasing cobalt content leads to a decrease in particle size and the formation of a more homogeneous spherical particle distribution, and this is consistent with XRD results. However, agglomeration was observed at higher cobalt ratios (<i>x</i> = 2 and <i>x</i> = 3), and particle size increased considerably. Finally, FTIR results clarified the functional groups of the nanoparticles according to the increasing Co ratio in Co_<i>x</i>Fe_3–<i>x</i>O₄ formulated samples. The photodynamic activity of the MB-loaded silica-coated CFNPs was investigated on MDA-MB-231 breast cancer cells after irradiation at 635 nm for 30 min. The MB-loaded CFNPs induced cell death in breast cancer cells following irradiation, indicating considerable photodynamic activity against breast cancer. This study highlights the potential of CFNPs as efficient photosensitizer delivery systems in PDT, presenting them as a promising therapeutic strategy for treating breast cancer.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"868 - 879"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elastic Properties and Acoustic Waves in TlFeS2 and TlFeSe2 Crystals","authors":"N. A. Abdullayev,&nbsp;Z. I. Badalova,&nbsp;Z. A. Jahangirli,&nbsp;R. A. Hasanova,&nbsp;S. S. Osmanova,&nbsp;Kh. V. Aliguliyeva,&nbsp;Yu. A. Abdullayev,&nbsp;S. Sh. Gahramanov,&nbsp;I. Q. Qasimoglu,&nbsp;S. S. Ragimov,&nbsp;A. M. Kerimova","doi":"10.1134/S1063783426601931","DOIUrl":"10.1134/S1063783426601931","url":null,"abstract":"<p>The values of thirteen elastic constants <i>C</i>₁₁, <i>C</i>₁₂, <i>C</i>₁₃, <i>C</i>₁₅, <i>C</i>₂₂, <i>C</i>₂₃, <i>C</i>₂₅, <i>C</i>₃₃, <i>C</i>₄₄, <i>C</i>₄₆, <i>C</i>₃₅, <i>C</i>₅₅, and <i>C</i>₆₆ for compounds TlFeS₂ and TlFeSe₂ have been calculated from first principles, and the bulk moduli of elasticity, shear and Young moduli, and Poisson’s ratios have been determined. The values of the Debye temperature and Grüneisen parameters of crystals TlFeS₂ and TlFeSe₂ have been estimated. Propagation velocities of longitudinal and transverse acoustic waves in TlFeS₂ crystals and TlFeSe₂ in different crystallographic directions, as well as temperature dependences of thermodynamic functions: free energy, phonon part of internal energy, entropy, heat capacity, and thermal conductivity, have been calculated from first principles.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"821 - 828"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Carbon Nanospheres via Self-Aggregation of SB3-12@NaCl","authors":"Chen Li,&nbsp;Huan Zhang,&nbsp;Zihan Zhen,&nbsp;Chenglong Shi","doi":"10.1134/S1063783426601657","DOIUrl":"10.1134/S1063783426601657","url":null,"abstract":"<p>Carbon nanomaterials, owing to their unique properties, demonstrate indispensable application value in fields such as environmental science, biomedicine, and sensing technology. However, existing methods still face challenges in achieving precise and controllable preparation of morphology and structure, particularly exhibiting significant limitations in terms of green synthesis and mild conditions. This study proposes a novel and environmentally friendly strategy for the preparation of carbon nanomaterials: the confined in situ carbonization method. This method enables the in situ transformation and structurally directed growth of carbon sources within a confined environment, offering a new approach for morphology control of carbon materials. To comprehensively characterize the structure and properties of the as-prepared materials, various analytical techniques were employed for systematic investigation. Specifically, scanning electron microscopy (SEM) was used to observe the microscopic morphology and size distribution; X-ray diffraction (XRD) was employed to analyze the crystal structure; Raman spectroscopy was applied to assess the degree of graphitization and defect states of the carbon materials; Fourier-transform infrared spectroscopy (FTIR) was utilized to detect surface functional groups; and energy-dispersive X-ray spectroscopy (EDS) was combined to determine the elemental distribution.Using this method, carbon nanospheres with a diameter of approximately 10 nm were successfully prepared, and their structural properties were systematically analyzed.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"880 - 885"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First-Principles Insights into Cs2BiCuBr6 and Cs2BiCuI6 Double Perovskites for Energy Applications","authors":"R. Mahesh,&nbsp;Anand Pandarinath M,&nbsp;M. Sravan Kumar,&nbsp;P. Sarah,&nbsp;P. Venugopal Reddy","doi":"10.1134/S1063783425603522","DOIUrl":"10.1134/S1063783425603522","url":null,"abstract":"<p>The structural, electrical, optical and thermoelectric characteristics of the Pb-free Cs₂BiCuBr₆ and Cs₂BiCuI₆ double perovskites are examined in this work using first-principles density functional theory (DFT). Both compounds are established to be structurally stable and exhibit semiconducting character with narrow bandgaps significantly influenced by spin–orbit coupling (SOC) effects due to presence of the heavy Bi atoms. Optical analysis reveals that Cs₂BiCuBr₆ and Cs₂BiCuI₆ possess superior visible-light absorption, higher dielectric response, and stronger optical conductivity, making it a promising candidate for optoelectronic devices. Thermoelectric analysis shows that Cs₂BiCuI₆ offers enhanced performance at high temperatures, while Cs₂BiCuBr₆ is more effective at room temperature due to its lower thermal conductivity. Cs₂BiCuBr₆ and Cs₂BiCuI₆ support flexible doping strategies for indirect bandgap semiconducting (<i>p</i>-type and <i>n</i>-type) applications.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"886 - 897"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of SiC Content on Structural, Optical, and Dielectric Characteristics of PVA-Based Nanocomposites: A Comprehensive Study","authors":"L. Gahramanli,&nbsp;M. Jafarov,&nbsp;M. Muradov,&nbsp;Sh. Alekberova","doi":"10.1134/S1063783425602784","DOIUrl":"10.1134/S1063783425602784","url":null,"abstract":"<p>In this study, SiC nanostructures in the form of nanowires have been synthesized by carbothermal reduction method at 1800°C, and SiC/Polyvinyl alcohol (PVA) nanocomposites with various filler contents (1‒10 wt %) have been obtained. X-ray diffraction (XRD) analysis confirmed the presence of the cubic β‑SiC (3C-SiC) phase together with the semi-crystalline structure of the PVA matrix. Using the Williamson–Hall method, the crystallite size for pure SiC was 13.84 nm and the microdeformation was −3.25 × 10^–3; the crystallite size for pure SiC was 39.23 nm using the Debye–Scherrer formula. In the compositions, at an increase in the fraction of SiC (1 → 7 wt %), the crystallite sizes decreased from 28.7 to 12.53 nm, and at 10 wt %, they increased to 13.94 nm. Optical analysis (Tauc plots) has revealed a narrowing of the band gap from 5.74 eV (PVA) to 4.99 eV (5 wt % SiC). The optical band gap (<i>E</i>_g) was not determined for the 7 and 10 wt % samples due to complete light absorption, which obscured the absorption edge. An inverse correlation between the crystallite size and <i>E</i>_g that is caused by interphase interactions of SiC nanowires with PVA hydroxyl groups and an increase in defect density has been established. The optimal concentration from the point of view of dispersion and structural stability was determined to be 7 wt % SiC/PVA.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":"68 10","pages":"853 - 859"},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}